F1-atpase Purification
F1-atpase Purification - Related Videos
07:38
Measuring In Vitro ATPase Activity for Enzymatic Characterization
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Cited by 27 •
2016
We describe a basic protocol for quantitating in vitro ATPase activity. This protocol can be optimized based on the level of activity and requirements for a given purified ATPase.
08:37
Purification of the Sarco-Endoplasmic Reticulum Ca2+-ATPase from Rabbit Muscle
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2025
This protocol describes an improved SERCA purification method, which includes the disaccharide trehalose in the final centrifugation step. This carbohydrate stabilizes proteins under harsh conditions. The purified SERCA was catalytically active and displayed high purity, making it suitable for structural and functional studies.
08:16
Plasmid Purification
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2023
Plasmid purification is a technique used to isolate and purify plasmid DNA from genomic DNA, proteins, ribosomes, and the bacterial cell wall. A plasmid is a small, circular, double-stranded DNA that is used as a carrier of specific DNA molecules. When introduced into a host organism via transformation, a plasmid will be replicated, creating numerous copies of the DNA fragment under study. In this video, a step-by-step generalized procedure is described for how to perform plasmid purification.
06:30
Gel Purification
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2023
Gel purification is used to recover DNA fragments after electrophoretic separation. DNA recovery from an agarose gel includes three basic steps: binding, washing and eluting from a silica column. DNA is believed to bind to silica in the presence of high salt via a salt bridge. Following binding, DNA is washed of impurities and eluted under low salt conditions disrupting this interaction. This video goes through a step-by-step, generalized procedure for cutting out a band from the gel, gel...
11:22
GST-His purification: A Two-step Affinity Purification Protocol Yielding Full-length Purified Proteins
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Cited by 18 •
2013
In the present protocol, we demonstrate a highly efficient and cost-effective small-scale protein purification method, which allows purification of recombinant proteins by uniquely combining a cleavable GST-tag and a small His-tag.
FAQs
The alpha and beta subunits form an alternating ring around the central gamma shaft. Catalytic ATP binding and hydrolysis occur at beta-subunit sites, while conformational changes in these subunits are coupled to movement of the gamma shaft. Purified F1-ATPase therefore allows researchers to connect subunit architecture with catalytic activity and the mechanical basis of rotary motion.
ATP hydrolysis and ATP synthesis represent opposing directions of the same energy-conversion relationship. Examining the soluble catalytic portion during hydrolysis helps reveal how beta-subunit conformational changes can drive rotation, while comparison with synthesis provides context for how rotary movement links chemical reactions to cellular energy production in mitochondrial and bacterial systems.
Preserving native assembly is essential because the catalytic and mechanical properties depend on coordinated interactions among the alpha, beta, and gamma subunits. If purification disrupts this organization or reduces ATPase activity, measurements may no longer reflect the intact molecular motor. Maintaining both features makes the preparation suitable for studying structure, kinetics, and rotational mechanism.
A typical workflow begins by disrupting membranes to release the soluble catalytic portion, followed by selective protein extraction to enrich the desired complex. Chromatographic separation then removes unwanted proteins and other components. Throughout these stages, conditions must support retention of the native subunit assembly and ATPase activity so the isolated preparation remains experimentally useful.
The preparation can support structural studies, enzyme-kinetic measurements, and analysis of rotary behavior. Researchers can relate observed ATPase activity to the organization of the alpha, beta, and gamma subunits, using the isolated complex to investigate how chemical reactions produce conformational changes and rotational movement. These outcomes clarify mechanisms of molecular motors and energy conversion.
It is useful when investigators need to examine the catalytic portion of ATP synthase independently of the membrane context. Preparations from mitochondrial or bacterial systems can support comparisons of energy-conversion mechanisms, ATP hydrolysis, and the connection between catalytic activity and rotation. This makes the method relevant to studies of ATP synthase function across these biological systems.